Search for a scalar top almost degenerate with the lightest neutralino e(+)e(-) collisions at root s up to 202 GeV

Barate, R; Decamp, D; Ghez, P; Goy, C; Jezequel, S; Lees, Jp; Martin, F; Merle, E; Minard, Mn; Pietrzyk, B; Bravo, S; Casado, Mp; Chmeissani, M; Crespo, Jm; Fernandez, E; Fernandez Bosman, M; Garrido, L; Grauges, E; Lopez, J; Martinez, M; Merino, C; Miquel, R; Mir, Lm; Pacheco, A; Paneque, D; Ruiz, H; Colaleo, A; Creanza, Donato Maria; DE FILIPPIS, Nicola; de Palma, M; Iaselli, Giuseppe; Maggi, Giorgio Pietro; Maggi, M; Nuzzo, S; Ranieri, A; Raso, G; Ruggieri, F; Selvaggi, G; Silvestris, L; Tempesta, P; Tricomi, A; Zito, G; Huang, X; Lin, J; Ouyang, Q; Wang, T; Xie, Y; R, Xu; Xue, S; Zhang, J; Zhang, L; Zhao, W; Abbaneo, D; Boix, G; Buchmuller, O; Cattaneo, M; Cerutti, F; Dissertori, G; Drevermann, H; Forty, Rw; Frank, Mi; Gianotti, F; Greening, Tc; Hansen, Jb; Harvey, J; Janot, P; Jost, B; Kado, M; Lemaitre, V; Maley, P; Mato, P; Minten, A; Moutoussi, A; Ranjard, F; Rolandi, L; Schlatter, D; Schmitt, M; Schneider, O; Spagnolo, P; Tejessy, W; Teubert, F; Tournefier, E; Valassi, A; Ward, Jj; Wright, Ae; Ajaltouni, Z; Badaud, F; Chazelle, G; Deschamps, O; Dessagne, S; Falvard, A; Gay, P; Guicheney, C; Henrard, P; Jousset, J; Michel, B; Monteil, S; Montret, Jc; Pallin, D; Pascolo, Jm; Ferret, F; Podlyski, F; Hansen, Jd; Hansen, Jr; Hansen, Ph; Nilsson, Bs; Waananen, A; Daskalakis, G; Kyriakis, A; Markou, C; Simopoulou, E; Vayaki, A; Blondel, A; Brient, Jc; Machefert, F; Rouge, A; Swynghedauw, M; Tanaka, R; Videau, H; Focardi, E; Parrini, G; Zachariadou, K; Antonelli, A; Antonelli, M; Bencivenni, G; Bologna, G; Bossi, F; Campana, P; Capon, G; Chiarella, V; Laurelli, P; Mannocchi, G; Murtas, F; Murtas, Gp; Passalacqua, L; Pepe Altarelli, M; Chalmers, M; Halley, Aw; Kennedy, J; Lynch, Jg; Negus, P; O'Shea, V; Raeven, B; Smith, D; Teixeira Dias, P; Thompson, As; Cavanaugh, R; Dhamotharan, S; Geweniger, C; Hanke, P; Hepp, V; Kluge, Ee; Leibenguth, G; Putzer, A; Tittel, K; Werner, S; Wunsch, M; Beuselinck, R; Binnie, Dm; Cameron, W; Davies, G; Dornan, Pj; Girone, M; Marinelli, N; Nowell, J; Przysiezniak, H; Sedgbeer, Jk; Thompson, Jc; Thomson, E; White, R; Ghete, Vm; Girtler, P; Kneringer, E; Kuhn, D; Rudolph, G; Bowdery, Ck; Buck, Pg; Clarke, Dp; Ellis, G; Finch, Aj; Foster, F; Hughes, G; Rwl, Jones; Robertson, Na; Smizanska, M; Giehl, I; Holldorfer, F; Jakobs, K; Kleinknecht, K; Krocker, M; Muller, As; Nurnberger, Ha; Quast, G; Renk, B; Rohne, E; Sander, Hg; Schmeling, S; Wachsmuth, H; Zeitnitz, C; Ziegler, T; Bonissent, A; Carr, J; Coyle, P; Curtil, C; Ealet, A; Fouchez, D; Leroy, O; Kachelhoffer, T; Payre, P; Rousseau, D; Tilquin, A; Aleppo, M; Gilardoni, S; Ragusa, F; Dietl, H; Ganis, G; Heister, A; Huttmann, K; Lutjens, G; Mannert, C; Manner, W; Moser, Hg; Schael, S; Settles, R; Stenzel, H; Wiedenmann, W; Wolf, G; Azzurri, P; Boucrot, J; Callot, O; Davier, M; Duflot, L; Grivaz, Jf; Heusse, P; Jacholkowska, A; Serin, L; Veillet, Jj; Videau, I; de Regie JBD,; Zerwas, D; Bagliesi, G; Boccali, T; Calderini, G; Ciulli, V; Foa, L; Giammanco, A; Giassi, A; Ligabue, F; Messineo, A; Palla, F; Rizzo, G; Sanguinetti, G; Sciaba, A; Sguazzoni, G; Tenchini, R; Venturi, A; Verdini, Pg; Blair, Ga; Coles, J; Cowan, G; Green, Mg; Hutchcroft, De; Jones, Lt; Medcalf, T; Strong, Ja; von Wimmersperg Toeller JH,; Clifft, Rw; Edgecock, Tr; Norton, Pr; Tomalin, Ir; Bloch Devaux, B; Boumediene, D; Colas, P; Fabbro, B; Faif, G; Lancon, E; Lemaire, Mc; Locci, E; Perez, P; Rander, J; Renardy, Jf; Rosowsky, A; Seager, P; Trabelsi, A; Tuchming, B; Vallage, B; Black, Sn; Dann, Jh; Loomis, C; Kim, Hy; Konstantinidis, N; Litke, Am; Mcneil, Ma; Taylor, G; Booth, Cn; Cartwright, S; Combley, F; Hodgson, Pn; Lehto, M; Thompson, Lf; Affholderbach, K; Bohrer, A; Brandt, S; Grupen, C; Hess, J; Misiejuk, A; Prange, G; Sieler, U; Borean, C; Giannini, G; Gobbo, B; H, He; Putz, J; Rothberg, J; Wasserbaech, S; Armstrong, Sr; Cranmer, K; Elmer, P; Dps, Ferguson; Gao, Y; Gonzalez, S; Hayes, Oj; H, Hu; Jin, S; Kile, J; Mcnamara, Pa; Nielsen, J; Orejudos, W; Pan, Yb; Saadi, Y; Scott, Ij; Walsh, J; J, Wu; Sl, Wu; X, Wu; Zobernig, G.

doi:10.1016/S0370-2693(00)00893-5

Data collected at centre-of-mass energies from 189 GeV to 202 GeV by the ALEPH detector at LEP corresponding to an integrated luminosity of 411 pb(-1), are analysed in a search for the scalar top in the decay channels (t) over tilde --> c/u chi for small mass differences between the stop and the lightest neutralino. No evidence for deviations from the Standard Model expectation is found and a lower limit of 59 GeV/c(2) is set for the stop mass, independent of the stop to neutralino mass difference and of the stop lifetime. (C) 2000 Elsevier Science B.V. All rights reserved.

Search for a scalar top almost degenerate with the lightest neutralino e(+)e(-) collisions at root s up to 202 GeV / Barate, R; Decamp, D; Ghez, P; Goy, C; Jezequel, S; Lees, Jp; Martin, F; Merle, E; Minard, Mn; Pietrzyk, B; Bravo, S; Casado, Mp; Chmeissani, M; Crespo, Jm; Fernandez, E; Fernandez Bosman, M; Garrido, L; Grauges, E; Lopez, J; Martinez, M; Merino, C; Miquel, R; Mir, Lm; Pacheco, A; Paneque, D; Ruiz, H; Colaleo, A; Creanza, Donato Maria; DE FILIPPIS, Nicola; de Palma, M; Iaselli, Giuseppe; Maggi, Giorgio Pietro; Maggi, M; Nuzzo, S; Ranieri, A; Raso, G; Ruggieri, F; Selvaggi, G; Silvestris, L; Tempesta, P; Tricomi, A; Zito, G; Huang, X; Lin, J; Ouyang, Q; Wang, T; Xie, Y; Xu, R; Xue, S; Zhang, J; Zhang, L; Zhao, W; Abbaneo, D; Boix, G; Buchmuller, O; Cattaneo, M; Cerutti, F; Dissertori, G; Drevermann, H; Forty, Rw; Frank, Mi; Gianotti, F; Greening, Tc; Hansen, Jb; Harvey, J; Janot, P; Jost, B; Kado, M; Lemaitre, V; Maley, P; Mato, P; Minten, A; Moutoussi, A; Ranjard, F; Rolandi, L; Schlatter, D; Schmitt, M; Schneider, O; Spagnolo, P; Tejessy, W; Teubert, F; Tournefier, E; Valassi, A; Ward, Jj; Wright, Ae; Ajaltouni, Z; Badaud, F; Chazelle, G; Deschamps, O; Dessagne, S; Falvard, A; Gay, P; Guicheney, C; Henrard, P; Jousset, J; Michel, B; Monteil, S; Montret, Jc; Pallin, D; Pascolo, Jm; Ferret, F; Podlyski, F; Hansen, Jd; Hansen, Jr; Hansen, Ph; Nilsson, Bs; Waananen, A; Daskalakis, G; Kyriakis, A; Markou, C; Simopoulou, E; Vayaki, A; Blondel, A; Brient, Jc; Machefert, F; Rouge, A; Swynghedauw, M; Tanaka, R; Videau, H; Focardi, E; Parrini, G; Zachariadou, K; Antonelli, A; Antonelli, M; Bencivenni, G; Bologna, G; Bossi, F; Campana, P; Capon, G; Chiarella, V; Laurelli, P; Mannocchi, G; Murtas, F; Murtas, Gp; Passalacqua, L; Pepe Altarelli, M; Chalmers, M; Halley, Aw; Kennedy, J; Lynch, Jg; Negus, P; O'Shea, V; Raeven, B; Smith, D; Teixeira Dias, P; Thompson, As; Cavanaugh, R; Dhamotharan, S; Geweniger, C; Hanke, P; Hepp, V; Kluge, Ee; Leibenguth, G; Putzer, A; Tittel, K; Werner, S; Wunsch, M; Beuselinck, R; Binnie, Dm; Cameron, W; Davies, G; Dornan, Pj; Girone, M; Marinelli, N; Nowell, J; Przysiezniak, H; Sedgbeer, Jk; Thompson, Jc; Thomson, E; White, R; Ghete, Vm; Girtler, P; Kneringer, E; Kuhn, D; Rudolph, G; Bowdery, Ck; Buck, Pg; Clarke, Dp; Ellis, G; Finch, Aj; Foster, F; Hughes, G; Jones, Rwl; Robertson, Na; Smizanska, M; Giehl, I; Holldorfer, F; Jakobs, K; Kleinknecht, K; Krocker, M; Muller, As; Nurnberger, Ha; Quast, G; Renk, B; Rohne, E; Sander, Hg; Schmeling, S; Wachsmuth, H; Zeitnitz, C; Ziegler, T; Bonissent, A; Carr, J; Coyle, P; Curtil, C; Ealet, A; Fouchez, D; Leroy, O; Kachelhoffer, T; Payre, P; Rousseau, D; Tilquin, A; Aleppo, M; Gilardoni, S; Ragusa, F; Dietl, H; Ganis, G; Heister, A; Huttmann, K; Lutjens, G; Mannert, C; Manner, W; Moser, Hg; Schael, S; Settles, R; Stenzel, H; Wiedenmann, W; Wolf, G; Azzurri, P; Boucrot, J; Callot, O; Davier, M; Duflot, L; Grivaz, Jf; Heusse, P; Jacholkowska, A; Serin, L; Veillet, Jj; Videau, I; de Regie, Jbd; Zerwas, D; Bagliesi, G; Boccali, T; Calderini, G; Ciulli, V; Foa, L; Giammanco, A; Giassi, A; Ligabue, F; Messineo, A; Palla, F; Rizzo, G; Sanguinetti, G; Sciaba, A; Sguazzoni, G; Tenchini, R; Venturi, A; Verdini, Pg; Blair, Ga; Coles, J; Cowan, G; Green, Mg; Hutchcroft, De; Jones, Lt; Medcalf, T; Strong, Ja; von Wimmersperg Toeller, Jh; Clifft, Rw; Edgecock, Tr; Norton, Pr; Tomalin, Ir; Bloch Devaux, B; Boumediene, D; Colas, P; Fabbro, B; Faif, G; Lancon, E; Lemaire, Mc; Locci, E; Perez, P; Rander, J; Renardy, Jf; Rosowsky, A; Seager, P; Trabelsi, A; Tuchming, B; Vallage, B; Black, Sn; Dann, Jh; Loomis, C; Kim, Hy; Konstantinidis, N; Litke, Am; Mcneil, Ma; Taylor, G; Booth, Cn; Cartwright, S; Combley, F; Hodgson, Pn; Lehto, M; Thompson, Lf; Affholderbach, K; Bohrer, A; Brandt, S; Grupen, C; Hess, J; Misiejuk, A; Prange, G; Sieler, U; Borean, C; Giannini, G; Gobbo, B; H, He; Putz, J; Rothberg, J; Wasserbaech, S; Armstrong, Sr; Cranmer, K; Elmer, P; Ferguson, Dps; Gao, Y; Gonzalez, S; Hayes, Oj; H, Hu; Jin, S; Kile, J; Mcnamara, Pa; Nielsen, J; Orejudos, W; Pan, Yb; Saadi, Y; Scott, Ij; Walsh, J; Wu, J; Wu, Sl; Wu, X; Zobernig, G.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 488:3-4(2000), pp. 234-246. [10.1016/S0370-2693(00)00893-5]